package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Component
public class RefreshTokenInterceptor implements HandlerInterceptor {

    @Resource
    private RedisTemplate redisTemplate;

    public RefreshTokenInterceptor(RedisTemplate redisTemplate) {
        this.redisTemplate = redisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)){
            return true;
        }

        //2.从redis中获取用户
        String Key = RedisConstants.LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = redisTemplate.opsForHash().entries(Key);

        //3.判断用户是否存在
        if (userMap.isEmpty()){
            return true;
        }

        //5.将获取的HashMap对象转为UserDTO
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        //6.存在，保存到ThreadLocal
        UserHolder.saveUser(userDTO);

        //7.刷新token有效期
        redisTemplate.expire(Key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);

        //8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }

}
